Varifan IC-610 - Page 40

Page 40
IC-610 - Intelligent Control
APPENDIX
Variable
speed fans
hooked to a
VSM module
make
humming
noise (in auto
mode) but do
not work
properly
− Fans are not
connected on the
same phase as
the IC-610
− Make sure the IC-
610 is on the
same phase as
the variable
speed fans
Ramping is
interrupted
− Ramping curve
was improperly
set or has
reached the last
day.
− Reset the curve
(points and days)
in chronological
order
LCD display
is blank
− Contrast has not
been adjusted
− Adjust contrast
with the
potentiometer
behind the
faceplate.
SYMPTOM CAUSE REMEDY
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